An anti-corrosion sol-gel coating composition for metal surfaces comprising: a first organosilane compound having at least one epoxy group and at least one hydrolysable alkoxy group; a second organosilane compound having no epoxy group and two or more hydrolysable alkoxy group, a corrosion inhibiting compound having phosphate functionality a polar solvent is selected from the group consisting of ethanol, methanol, n-propanol, isopropanol, n-butanol, isobutanol, and mixture thereof, an acid selected from acetic acid, citric acid, phosphoric acid, hydrochloric acid and mixture thereof, water.
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